One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4,7,8)(5,6,10,9)(19,20,23,22)(21,25,26,24)(4,8)(6,9)(11,12)(13,17)(14,15)(16,18)(19,20,23,22)(21,24,26,25)(4,8)(5,10)(12,15)(16,17)(19,21,23,26)(20,24,22,25)(3,5,7,10)(4,9,8,6)(11,12)(13,16)(14,15)(17,18)(19,22,23,20)(21,25,26,24)(3,6,7,9)(4,10,8,5)(11,13,14,18)(12,16,15,17)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.